Planetary gear train of automatic transmission for vehicle

Abstract

A planetary gear train of an automatic transmission may include input shaft, output shaft, first planetary gear set including first to third rotation elements, second planetary gear set including fourth to sixth rotation elements, third planetary gear set including seventh to ninth rotation elements, fourth planetary gear set including tenth to twelfth rotation elements, and six control elements disposed at portions selectively connecting between the rotation elements and between the rotation elements and a transmission housing, wherein the input shaft is directly connected to the fourth rotation element and the eighth rotation element, the output shaft is directly connected to the eleventh rotation element, the tenth rotation element is directly connected to the third rotation element while being selectively connected to the seventh rotation element, the second rotation element is selectively connected to the sixth rotation element, and the first rotation element is directly connected to the transmission housing.

What is claimed is: 
     
       1. A planetary gear train of an automatic transmission for a vehicle, comprising:
 an input shaft receiving power of an engine; 
 an output shaft outputting shifted power; 
 a first planetary gear set including first, second, and third rotation elements; 
 a second planetary gear set including fourth, fifth, and sixth rotation elements; 
 a third planetary gear set including seventh, eighth, and ninth rotation elements; 
 a fourth planetary gear set including tenth, eleventh, and twelfth rotation elements; and 
 six control elements disposed at portions selectively connecting between the rotation elements and between the rotation elements and a transmission housing, 
 wherein the input shaft is directly connected to the fourth rotation element and the eighth rotation element, 
 wherein the output shaft is directly connected to the eleventh rotation element, 
 wherein the tenth rotation element is directly connected to the third rotation element while being selectively connected to the seventh rotation element, 
 wherein the second rotation element is selectively connected to the sixth rotation element, 
 wherein the first rotation element is directly connected to the transmission housing, and 
 wherein three of the six control elements are operated to implement 9 forward speed shift stages and at least one reverse shift stage. 
 
     
     
       2. The planetary gear train of the automatic transmission for the vehicle of  claim 1 , wherein
 the fifth rotation element is selectively connected to the third rotation element while being selectively connected to the transmission housing; 
 the twelfth rotation element is selectively connected to the transmission housing; and 
 at least two of the fourth, fifth, and sixth rotation elements of the second planetary gear set are selectively connected to each other. 
 
     
     
       3. The planetary gear train of the automatic transmission for the vehicle of  claim 1 , wherein
 the first, second, and third rotation elements of the first planetary gear set are a sun gear, a planetary carrier, and a ring gear, respectively; 
 the fourth, fifth, and sixth rotation elements of the second planetary gear set are a sun gear, a planetary carrier, and a ring gear, respectively; 
 the seventh, eighth, and ninth rotation elements of the third planetary gear set are a sun gear, a planetary carrier, and a ring gear, respectively; and 
 the tenth, eleventh, and twelfth rotation elements of the fourth planetary gear set are a sun gear, a planetary carrier, and a ring gear, respectively. 
 
     
     
       4. The planetary gear train of the automatic transmission for the vehicle of  claim 1 , wherein the six control elements include two brakes and four clutches. 
     
     
       5. A planetary gear train of an automatic transmission for a vehicle, comprising:
 an input shaft receiving power of an engine; 
 an output shaft outputting shifted power; 
 a first planetary gear set including first, second, and third rotation elements; 
 a second planetary gear set including fourth, fifth, and sixth rotation elements; 
 a third planetary gear set including seventh, eighth, and ninth rotation elements; 
 a fourth planetary gear set including tenth, eleventh, and twelfth rotation elements; 
 six control elements disposed at portions selectively connecting between the rotation elements and between the rotation elements and a transmission housing; 
 a first shaft configured to include the first rotation element and directly connected to the transmission housing; 
 a second shaft configured to include the second rotation element; 
 a third shaft configured to include the third rotation element and the tenth rotation element; 
 a fourth shaft configured to include the fourth rotation element and the eighth rotation element and directly connected to the input shaft; 
 a fifth shaft configured to include the fifth rotation element and selectively connected to the transmission housing while being selectively connected to the third shaft and the fourth shaft; 
 a sixth shaft configured to include the sixth rotation element and selectively connected to the second shaft; 
 a seventh shaft configured to include the seventh rotation element and selectively connected to the third shaft; 
 an eighth shaft configured to include the ninth rotation element and the eleventh rotation element and directly connected to the output shaft to thereby continuously be operated as an output element; and 
 a ninth shaft configured to include the twelfth rotation element and selectively connected to the transmission housing. 
 
     
     
       6. The planetary gear train of the automatic transmission for the vehicle of  claim 5 , wherein
 in the first planetary gear set, which is a single pinion planetary gear set, the first rotation element is a first sun gear, the second rotation element is a first planetary carrier, and the third rotation element is a first ring gear; 
 in the second planetary gear set, which is a single pinion planetary gear set, the fourth rotation element is a second sun gear, the fifth rotation element is a second planetary carrier, and the sixth rotation element is a second ring gear; 
 in the third planetary gear set, which is a single pinion planetary gear set, the seventh rotation element is a third sun gear, the eighth rotation element is a third planetary carrier, and the ninth rotation element is a third ring gear; and 
 in the fourth planetary gear set, which is a single pinion planetary gear set, the tenth rotation element is a fourth sun gear, the eleventh rotation element is a fourth planetary carrier, and the twelfth rotation element is a fourth ring gear. 
 
     
     
       7. The planetary gear train of the automatic transmission for the vehicle of  claim 5 , wherein the six control elements include:
 a first clutch selectively connecting the fourth shaft and the fifth shaft to each other; 
 a second clutch selectively connecting the third shaft and the fifth shaft to each other; 
 a third clutch selectively connecting the third shaft and the seventh shaft to each other; 
 a fourth clutch selectively connecting the second shaft and the sixth shaft to each other; 
 a first brake selectively connecting the fifth shaft and the transmission housing to each other; and 
 a second brake selectively connecting the ninth shaft and the transmission housing to each other. 
 
     
     
       8. The planetary gear train of the automatic transmission for the vehicle of  claim 7 , wherein the first clutch is disposed in front of the first planetary gear set. 
     
     
       9. The planetary gear train of the automatic transmission for the vehicle of  claim 7 , wherein the first clutch is disposed between the second planetary gear set and the third planetary gear set. 
     
     
       10. The planetary gear train of the automatic transmission for the vehicle of  claim 7 , wherein shift stages implemented by selective operations of the six control elements include:
 a first forward shift stage implemented by simultaneous operations of the second and third clutches and the second brake; 
 a second forward shift stage implemented by simultaneous operations of the first and second clutches and the second brake; 
 a third forward shift stage implemented by simultaneous operations of the first and fourth clutches and the second brake; 
 a fourth forward shift stage implemented by simultaneous operations of the first and third clutches and the second brake; 
 a fifth forward shift stage implemented by simultaneous operations of the first, third, and fourth clutches; 
 a sixth forward shift stage implemented by simultaneous operations of the first, second, and third clutches; 
 a seventh forward shift stage implemented by simultaneous operations of the second, third, and fourth clutches; 
 an eighth forward shift stage implemented by simultaneous operations of the second and third clutches and the first brake; 
 a ninth forward shift stage implemented by simultaneous operations of the third and fourth clutches and the first brake; and 
 a reverse shift stage implemented by simultaneous operations of the fourth clutch and the first and second brakes. 
 
     
     
       11. The planetary gear train of the automatic transmission for the vehicle of  claim 7 , wherein shift stages implemented by selective operations of the six control elements include:
 a first forward shift stage implemented by simultaneous operations of the second and third clutches and the second brake; 
 a second forward shift stage implemented by simultaneous operations of the first and second clutches and the second brake; 
 a third forward shift stage implemented by simultaneous operations of the first and fourth clutches and the second brake; 
 a fourth forward shift stage implemented by simultaneous operations of the third and fourth clutches and the second brake; 
 a fifth forward shift stage implemented by simultaneous operations of the first, third, and fourth clutches; 
 a sixth forward shift stage implemented by simultaneous operations of the first, second, and third clutches; 
 a seventh forward shift stage implemented by simultaneous operations of the second, third, and fourth clutches; 
 an eighth forward shift stage implemented by simultaneous operations of the second and third clutches and the first brake; 
 a ninth forward shift stage implemented by simultaneous operations of the third and fourth clutches and the first brake; and 
 a reverse shift stage implemented by simultaneous operations of the fourth clutch and the first and second brakes. 
 
     
     
       12. A planetary gear train of an automatic transmission for a vehicle, comprising:
 an input shaft receiving power of an engine; 
 an output shaft outputting shifted power; 
 a first planetary gear set including first, second, and third rotation elements; 
 a second planetary gear set including fourth, fifth, and sixth rotation elements; 
 a third planetary gear set including seventh, eighth, and ninth rotation elements; 
 a fourth planetary gear set including tenth, eleventh, and twelfth rotation elements; 
 a first shaft configured to include the first rotation element and directly connected to a transmission housing; 
 a second shaft configured to include the second rotation element; 
 a third shaft configured to include the third rotation element and the tenth rotation element; 
 a fourth shaft configured to include the fourth rotation element and the eighth rotation element and directly connected to the input shaft; 
 a fifth shaft configured to include the fifth rotation element and selectively connected to the transmission housing while being selectively connected to the third shaft and the fourth shaft; 
 a sixth shaft configured to include the sixth rotation element and selectively connected to the second shaft; 
 a seventh shaft configured to include the seventh rotation element and selectively connected to the third shaft; 
 an eighth shaft configured to include the ninth rotation element and the eleventh rotation element and directly connected to the output shaft to thereby continuously be operated as an output element; 
 a ninth shaft configured to include the twelfth rotation element and selectively connected to the transmission housing; 
 a first clutch selectively connecting the fourth shaft and the fifth shaft to each other; 
 a second clutch selectively connecting the third shaft and the fifth shaft to each other; 
 a third clutch selectively connecting the third shaft and the seventh shaft to each other; 
 a fourth clutch selectively connecting the second shaft and the sixth shaft to each other; 
 a first brake selectively connecting the fifth shaft and the transmission housing to each other; and 
 a second brake selectively connecting the ninth shaft and the transmission housing to each other. 
 
     
     
       13. The planetary gear train of the automatic transmission for the vehicle of  claim 12 , wherein
 in the first planetary gear set, which is a single pinion planetary gear set, the first rotation element is a first sun gear, the second rotation element is a first planetary carrier, and the third rotation element is a first ring gear; 
 in the second planetary gear set, which is a single pinion planetary gear set, the fourth rotation element is a second sun gear, the fifth rotation element is a second planetary carrier, and the sixth rotation element is a second ring gear; 
 in the third planetary gear set, which is a single pinion planetary gear set, the seventh rotation element is a third sun gear, the eighth rotation element is a third planetary carrier, and the ninth rotation element is a third ring gear; and 
 in the fourth planetary gear set, which is a single pinion planetary gear set, the tenth rotation element is a fourth sun gear, the eleventh rotation element is a fourth planetary carrier, and the twelfth rotation element is a fourth ring gear. 
 
     
     
       14. The planetary gear train of the automatic transmission for the vehicle of  claim 12 , wherein the first clutch is disposed in front of the first planetary gear set. 
     
     
       15. The planetary gear train of the automatic transmission for the vehicle of  claim 12 , wherein the first clutch is disposed between the second planetary gear set and the third planetary gear set. 
     
     
       16. The planetary gear train of the automatic transmission for the vehicle of  claim 12 , wherein shift stages implemented by selective operations of the first, second, third, and fourth clutches and the first and second brakes include:
 a first forward shift stage implemented by simultaneous operations of the second and third clutches and the second brake; 
 a second forward shift stage implemented by simultaneous operations of the first and second clutches and the second brake; 
 a third forward shift stage implemented by simultaneous operations of the first and fourth clutches and the second brake; 
 a fourth forward shift stage implemented by simultaneous operations of the first and third clutches and the second brake; 
 a fifth forward shift stage implemented by simultaneous operations of the first, third, and fourth clutches; 
 a sixth forward shift stage implemented by simultaneous operations of the first, second, and third clutches; 
 a seventh forward shift stage implemented by simultaneous operations of the second, third, and fourth clutches; 
 an eighth forward shift stage implemented by simultaneous operations of the second and third clutches and the first brake; 
 a ninth forward shift stage implemented by simultaneous operations of the third and fourth clutches and the first brake; and 
 a reverse shift stage implemented by simultaneous operations of the fourth clutch and the first and second brakes. 
 
     
     
       17. The planetary gear train of the automatic transmission for the vehicle of  claim 12 , wherein shift stages implemented by selective operations of the first, second, third, and fourth clutches and the first and second brakes include:
 a first forward shift stage implemented by simultaneous operations of the second and third clutches and the second brake; 
 a second forward shift stage implemented by simultaneous operations of the first and second clutches and the second brake; 
 a third forward shift stage implemented by simultaneous operations of the first and fourth clutches and the second brake; 
 a fourth forward shift stage implemented by simultaneous operations of the third and fourth clutches and the second brake; 
 a fifth forward shift stage implemented by simultaneous operations of the first, third, and fourth clutches; 
 a sixth forward shift stage implemented by simultaneous operations of the first, second, and third clutches; 
 a seventh forward shift stage implemented by simultaneous operations of the second, third, and fourth clutches; 
 an eighth forward shift stage implemented by simultaneous operations of the second and third clutches and the first brake; 
 a ninth forward shift stage implemented by simultaneous operations of the third and fourth clutches and the first brake; and 
 a reverse shift stage implemented by simultaneous operations of the fourth clutch and the first and second brakes.